Search Publications
An XMM-Newton EPIC X-Ray View of the Symbiotic Star R Aquarii
Toalá, Jesús A.; Sabin, Laurence; Guerrero, Martín A. +2 more
We present the analysis of archival XMM-Newton European Photon Imaging Camera (EPIC) X-ray observations of the symbiotic star R Aquarii. We used the Extended Source Analysis Software package to disclose diffuse soft X-ray emission extending up to 2.'2 (≈0.27 pc) from this binary system. The depth of these XMM-Newton EPIC observations reveals in un…
Nonthermal Radio Continuum Emission from Young Nearby Stars
Reffert, Sabine; Forbrich, Jan; Loinard, Laurent +5 more
Young and magnetically active low-mass stars often exhibit nonthermal coronal radio emission owing to the gyration of electrons in their magnetized chromospheres. This emission is easily detectable at centimeter wavelengths with the current sensitivity of large radio interferometers like the Very Large Array (VLA). With the aim of identifying near…
Jansky Very Large Array Detections of CO(1-0) Emission in H I-absorption-selected Galaxies at z ≳ 2
Prochaska, J. X.; Revalski, M.; Rafelski, M. +3 more
We report a Karl G. Jansky Very Large Array search for redshifted CO(1-0) emission from three H I-absorption-selected galaxies at z ≈ 2, identified earlier in their CO(3-2) or CO(4-3) emission. We detect CO(1-0) emission from DLA B1228-113 at z ≈ 2.1933 and DLA J0918+1636 at z ≈ 2.5848; these are the first detections of CO(1-0) emission in high-z …
Revisiting the Revisited Palmer Consensus: New Insights from Jovian Electron Transport
Engelbrecht, N. Eugene; Burger, R. A.; Herbst, Konstantin +2 more
Novel insights into the behavior of the diffusion coefficients of charged particles in the inner heliosphere are of great importance to any study of the transport of these particles and are especially relevant with regard to the transport of low-energy electrons. The present study undertakes an exhaustive investigation into the diffusion parameter…
Magnetic Field of Molecular Gas Measured with the Velocity Gradient Technique I. Orion A
Li, Dalei; Tang, Xindi; Zhou, Jianjun +8 more
Magnetic fields play an important role in the evolution of molecular clouds and star formation. Using the velocity gradient technique (VGT) model, we measured the magnetic field in Orion A using the 12CO, 13CO, and C18O(1-0) emission lines at a scale of ~0.07 pc. The measured B field shows an east-west orientation …
The Mg-K Anticorrelation in ω Centauri
Mucciarelli, Alessio; Bellazzini, Michele; Lardo, Carmela +2 more
We present [K/Fe] abundance ratios for a sample of 450 stars in ω Centauri, using high-resolution spectra acquired with the multiobject spectrograph FLAMES@VLT. Abundances for Fe, Na, and Mg were also derived. We detected intrinsic K variations in the analyzed stars. Moreover, [K/Fe] shows a significant correlation with [Na/Fe] and an anticorrelat…
Evidence for Centrifugal Breakout around the Young M Dwarf TIC 234284556
Montet, Benjamin T.; Hartman, Joel D.; Feinstein, Adina D. +5 more
Magnetospheric clouds have been proposed as explanations for depth-varying dips in the phased light curves of young, magnetically active stars such as σ Ori E and RIK-210. However, the stellar theory that first predicted magnetospheric clouds also anticipated an associated mass-balancing mechanism known as centrifugal breakout for which there has …
The Internal Proper Motion Kinematics of NGC 346: Past Formation and Future Evolution
Anderson, J.; Lennon, D. J.; Sabbi, E. +6 more
We investigate the internal kinematics of the young star-forming region NGC 346 in the Small Magellanic Cloud (SMC). We used two epochs of deep F555W and F814W Hubble Space Telescope Advanced Camera for Surveys observations with an 11 yr baseline to determine proper motions and study the kinematics of different populations, as identified by their …
New Constraints on Cosmic Particle Populations at the Galactic Center Using X-Ray Observations of the Molecular Cloud Sagittarius B2
Zhang, Shuo; Clavel, Maïca; Perez, Kerstin +2 more
The Sagittarius B2 (Sgr B2) molecular cloud complex is an X-ray reflection nebula whose nonthermal X-ray emissions have continued to decrease since 2001 as it reprocesses one or more past energetic outbursts from the supermassive black hole Sagittarius A* at the Galactic Center. The X-ray reflection model explains the observed time variability of …
Acceleration and Expansion of a Coronal Mass Ejection in the High Corona: Role of Magnetic Reconnection
Temmer, Manuela; Lugaz, Noé; Zhuang, Bin +2 more
The important role played by magnetic reconnection in the early acceleration of coronal mass ejections (CMEs) has been widely discussed. However, as CMEs may have expansion speeds comparable to their propagation speeds in the corona, it is not clear whether and how reconnection contributes to the true acceleration and expansion separately. To addr…